Specifications: Name: Spill Stopper for Stanley Cup. Material: Food grade silicone, dishwasher safe. Suitable: The silicone sealing kit is compatible with Stanley Cup 1.0 40/30 oz Package Included: 2x Center Round Leak Stopper 2x Square Spill Stopperl 2x Straw Cover Our Stanley tumbler accessories are priced affordably, packaged compactly, and easy to carry. They are the perfect companion for your cup and can be used by yourself or given as a gift to your family and friends. Tool-free, easy to install, and can be removed when not needed without affecting the original lids. 【High Quality Material】The seal kit is made of food-grade silicone, odorless, BPA free,easy to clean, dishwasher safe. 【Good Sealing】Improved leak-proof stopper, effective sealing, 360-degree rotatable cup, no spillage, easy drinking. 【Easy To Install】Our Stanley cup spill stopper is easy to install. Just place it on top of your Stanley cup 1.0 and press it down firmly. It fits snugly and securely. 【Set includes】Accessories Including 2 straw cover cap, 2 square spill stopper and 2 round lid leak stopper, only compatible with Stanley tumbler 1.0 40oz & 30oz. 【Perfect Service】If you have any problems and questions about silicone spill plugs, please feel free to contact us and we will be at your service.